Conversion of hydrocarbons



nJan. 8, 1935.

F. WINKLER Ef AL CONVERSION 0F HYDROCARBONS vFiled May 1:5, 1951 0 v c WWF v w. Y Y Y n w. 7 Z

which 'are exposed to the temperatures ,at which.

Unid manna..

y Patented Jan. `8, 1935 mausi COVERSION 0F HYDBOCARBONS Fritz' Winkler and Paul Feuer.'

the-Rhine', and Hermann W heim, Germany, assignors -dustrie Aktiengesellschaft, Franldort-on-the- Application In Ludwigshafen-oneigmann, to .1. G. -Farbenin- May 1s, i931, serial No. 537,206 Germany May 2l, 1930 .5 claims. A(ci. 19e-1o) of hydrocarbonsby heat treatment.

When the conversion of gaseous hydrocarbons at temperatures -above 500 C., as for example.

liquid hydrocarbons as for example benzene, isV

carriedout in a continuous or interrupted operation, -in vessels'of ceramic material, as forex- -ample chamotte, which is cheap and excellent yas regards heat technics, there is the objection that the material at the necessary temperaturescatalytically favours the formation of carbon,

duced.

We vhave now found that the said objection ist. avoided and excellent yields of valuable hydro-- carbons are obtained when the walls of the recatalytically unfavourable refractory materials,

such as chamotte, or refractory metals, for ex-y ample chromium-nickel-steel, are provided on theinside partly or whollywith a coating ofinvthe reaction. occurs may be coated with said 'inorganic substances; As such substances come into-question' silicates, phosphates and borates 'of alkaline or alkaline earth metals or of copper,v

j manganese, 1ead,chromium and the like may be employed. These are applied'to the material in .cheap refractory materials, such as chamotte or materials vcontaining large amounts lof silicon .cai-bide, for example those .known .under the wlthfinorganic discontinuously (as for Cowsmeunmguwen'asthennm.-

is oteeramic gnaterlalsuchaa einem uyfreaaonmiuhish andatahmtymneaam munies,

action chamber, especially when they consist of trade-'mark Kartellite 0r."-Stel18fcarbi de-, may we@ me ver?" to h ll the reaction wholly'orpartly with l'I'he present invention relates to the conversion as for example silicides or carbldes, may ue added .to the coatings.

The nature or theinvention will be further described with reference to the accompanying drawing. which illustrates diagrammatically a vertical section of a lheat chamber according to the invention but the'invention is not restricted to the particular example shown.

The Cowper shown in the said drawing Whic is 6 meters in height and which has' a free crosssection of 0.33 square meter is filled with bodies- A of a heat resistant material, suchas chamotte, which is lined with a glaze B. Similarly the walls` C are internally lined with aglaze D, which may bemade of the same substance as glaze B. For -heating up the Cowper heating gasesareintroduced at 5, while air is supplied at 6. When the desired temperature is reached the supply of the heating gasesvand the air is shut off and the gaseousl hydrocarbons to be converted are introduced at 0. The converted gases and vapors are withdrawn at 4. 4

'I'he following examples will further illustrate the natureV of this invention but the invention is v not restricted to these examples.

Example 1 sodium calcium silicate in the' cold and then sintered and fused at aboutl1200 centigrade. This material is introduced into a chamotte tube Chamott'e material is coated with a layer oiy 20 m'illimetres in internal diameter provided with an internal coating in the same way. per cent methane is then led at ordinary pressure with a velocity of 25 litres per hour through this tube which is, heated to 1050 centigrade over a length lof 60.centimetres. A condensate is-obtained by Vstrongly cooling the vapours formedLand this consists mainly of benzene.. The remaining gas the composition:

' 1.8 per vcent of 37.6 per cent-of Hz 54.0 per cent'of C H4 6.6 percent of Na I .No.injuriousformationfof carbon black can be observed afterfoperation for long periodgoftime. i "-Eaaample V2g;v ilj cent oi' e 39,5'perv cent of propaneandja per 'center butane'isledl-at ordinal-ir pressure at 850 eentigradeand .with4 a velocity. of vili'litres per chamottematerlal asin* mmm-@Mmmm 1'.; aso mmsqi 2 1,087,092. v V is per'hour through a tube of chaniotte'.:`

The residual gasconsists of:l

2.6 per cent -of higher olefines 27.6- per cent of Csm Loper centof CO 24.2 per centof H: 39.6 per cent'of- C34 5.0 per cent of-Nz No injurious formation of carbon black can be f observed even after operation for long Periods of Example3 A cowper 6 metres in height -is filled. wi chamotte plates having 'a total heating surface of 15 square metres, the innerwall of the Co'wper as well as said plates being'previously squirted with a paste of s mixture of feldspar, nuor spar' and quartz and then heated to about 1-i00certi- Y grade, whereby vitrication 3.5 cubic metres of 85 per cent methane are thenled within 6 minutes through the Cowper heated to 1100. cent e. From each cubic metre of initialgas obtained 45 grams of a condensate containing 55 per cent of benzene and 1.2 cubic metres of a gas having the following composition: 2.0 per cent of carbon dioxide, 2.2 per cent: of olefmes, 0.8 per cent of carbon monoxide, 32.0 percent of hydrogen, 56.8 per cent of methanev and 6.2 per cent of nitrogen.

Example 4 v 23 litres of a 90 per cent 'methane are passed per .hour through a porcelain tube 15 millimetres in internaldiameter which has been internally coated with a glaze of a lead silicate composed of per cent of silicio acid, 36 per cent. of lead oxide and 23 per cent of a mixture of silicates of 'sodium and potassium, and which is heated to 1050" centigradc Within a iength of 90 'centimeters By one passage of each cubic meter of methane grams of a condensate consisting mainiy of benzene are obtained. The final gas contains 66 per cent of unconverted methane and may be treated again. A clogging up of the tube by deposition of carbon does not take place even after operating for long periods oi time.

A melt of chromiumsilicate obtained from 2 parts of chromium oxide and 98 parts of glass powder is applied to and melted on the innerV4 surface of a porcelain tube 15 millimeters in internal diameter. 23 litres of a 90 per cent methane are passed per hour through this tube while heating the same to a temperature of 1050 centigrade withina length of 90 centimeters. By one passage each 'cubic meter of mei-.haueA yields 36 4grams of a condensate consisting mainly of benzene.

' tion:

'0I time.

The nnal gas contains 65 per cent of unchanged methane and maybe treated again. A clogging up of the tube by deposition of carbondoes not take. place even after operating for long Example s 201iters ofagashavlngthefollowinscomposi-- 4.3 per eentlby cfff'crn t 28.0per cent by volume of CamiV (L5-'per cent .by volume-.of GBA' `'1.1ipereentbyvolume ofCnHs 0.5 percent byvolume ofternally with a ceramic coatingprepared by durinngthe 'X15 .mnumers in internal mmnwmen am meter-of ini 300 gramsof a condensate consisting mainly v.of methane' are thus obtained and in addition 2 cubic meters of 'a'gas having the following composition:

29.4 per cent by volume of CnHznl 0A per cent by volume of C0 26.8.per cent-by volume-of Hg 43.2-per cent by-volumeof CH4 0.2 per cent by volume of Na after working for 60 hours no formation" of soot could be'observ'eci.v

Insteadof borax sodium phosphate maybe employed with the same success.

What we claim is:

1. 'In the conversion of a into olenes and'aroma'tic hydrocarbons at a temperature above 500` C., the step which comprises contactingy said hydrocarbon with a glaze,on a refractory material comprising a substanceselectedfrom the group consisting of the silicides,

the carbides and chamotte, of an inorganic substance selected fronnthe group consisting of the silicates, phosphates and borates oi' copper, manganese, lead and chromium.

2. In'the conversion of a gaseous hydrocarbon into 'olenes and aromatic hydrocarbons at a'.

temperature above 500 C., the step which acomprises contacting said hydrocarbon with a glaze, on chamotte, of an inorganic substance selected from the group consisting'of the silicates, phosphates and borates of copper, manganese, lead and chromium.

3. In the conversion of a gaseous hydrocarbon into olenes and-aromatic hydrocarbons at a temperature above 500 C., the step which comprises contacting said hydrocarbon with a glaze,

on avrefractory material comprising silicon carbide, of an inorganic substance selected from the group consisting of the silicates, phosphates and borates of copper, manganese, lead and cmo- 4. In the production of liquid hydrocarbons by heating methane to a temprature above 900 C.. the step which comprises contacting said methane with a glaze, on a refractory material comprising asubstance selected from the group comistingof the silicides, the carbides'v and chamotte. of an inorganic substancey selected from the group consisting of the silicates, phosphates and borates of copper, manganese, lead and 5. Afurnacetheliningandthenllingofwhich, consisting of a refractory material comprising a selected from the group consisting of the silicides, the carbides and chamotte, is coated selected from the group of the silicates, phosphates and borateslof copper,

ganese, lead andchromium.

-PAULFEILER.

HERMANN fioy 

